New Chemical Kills 95% of Termites, Safe for Humans

Termites might have finally met their match, and it comes down to a biological weakness they can't escape.

Researchers at the University of California, Riverside discovered that a chemical called bistrifluron can wipe out drywood termite colonies by preventing the insects from forming new exoskeletons when they molt. In lab tests, the treatment killed about 95% of termites without the toxic side effects that make traditional fumigation so stressful for families.

"This chemical is more environmentally friendly than ones traditionally used for drywood termite infestations," said Nicholas Poulos, a doctoral student who led the research. "It's specific to insects and can't harm humans."

The secret is in how termites grow. Unlike humans with internal skeletons, termites wear their support system on the outside as an exoskeleton made mostly of chitin. Every time they grow, they must shed the old shell and build a new one, a process they repeat about seven times in their lives.

Bistrifluron blocks that critical step. Termites exposed to the chemical try to molt but can't form the protective shell they need to survive.

What makes this approach even smarter is how termites spread it themselves. The insects share food and gut microbes through a behavior called proctodeal trophallaxis. When some termites feed on treated wood, they pass material to colony mates within 24 to 48 hours.

In transfer tests, exposing just 5% of a colony led to 100% mortality within 90 days. The chemical traveled through social networks hidden inside the wood, reaching termites that never touched the treated material directly.

Professor Dong-Hwan Choe, who supervised the study, sees huge potential for spot treatments that don't require tenting an entire home. "You don't have to apply too much to get a very good result," he said.

The Bright Side

Traditional fumigation forces families to leave their homes, bag their food, and wait anxiously before returning. It's toxic, expensive, and offers no protection against future infestations.

Bistrifluron changes that equation. Because it can stay active in wood for extended periods, it might prevent new colonies from taking hold. Homeowners could treat problem areas directly instead of evacuating for days.

The treatment works slower than fumigation, taking about two months for full colony collapse. But the tradeoff delivers lower toxicity, more targeted action, and potentially longer-lasting protection as drywood termites spread into new regions.

Choe's team is also exploring chemical lures that could draw termites toward treated wood, making the approach even more effective. The combination of attractants and chitin blockers could give homeowners a powerful new tool that works with termite biology instead of just poisoning everything in sight.

For the millions of families dealing with hidden termite damage each year, a safer solution is finally emerging from the wood.